How do you remove frames in Blender?
I don't think you can remove frames. However, you can go into the "Animation" screen and move your keyframes closer together.

Go to the top of the window where it says "Default" and from the drop-down choose "Animation". You'll get a Dope-sheet on your left. You have to find your keyframe, select it and move it. Normal keys for selecting and moving, thus A for toggling selection, right-click for selecting, and G for moving.